How to add a Klaviyo embed form to your BigCommerce site
Estimated 3 minute read
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Updated Aug 7, 2025, 12:00 AM EST
You will learn
Learn how to add a Klaviyo embed form to your BigCommerce site, which requires creating the form in Klaviyo, and then pasting it's embed code to your site’s files where you want it to appear (e.g., the footer).
This guide shows how to replace the BigCommerce default sign-up form with a Klaviyo embed form.
Before you begin
Before creating an embed form in Klaviyo, you must first integrate with BigCommerce, and then enable sign-up form functionality (also called "onsite tracking"). If you checked the setting Automatically add Klaviyo onsite JavaScript when integrating with BigCommerce, you’re all set.
If not:
- In Klaviyo, select the Integrations tab.
- Click BigCommerce.
- Check the setting Automatically add Klaviyo onsite javascript.
- Click Save.
The example in this article uses BigCommerce’s default Cornerstone theme. Keep in mind that your theme may differ, along with the names of some files or locations of code snippets.
Adding the form's embed code to your site
First, create and publish an embed form in Klaviyo. This section will go over the next steps of pasting your form's embed code on your BigCommerce site so it displays and syncs data properly.
- If you have not already, copy the embed code for your embed form. You can access the form’s embed code by opening the form in the editor and clicking into the Targeting & behavior section.
- Navigate to your website and locate the default BigCommerce sign-up form. If you’re using a Cornerstone theme, it’s in the footer of the site.
- If you do not see a default form on your website:
- Open your BigCommerce dashboard.
- Navigate to Marketing > Email Marketing
- Check the box labeled Allow newsletter subscriptions. This enables you to collect email consent from visitors on your website, and also adds a default email sign-up box on your BigCommerce site. If this box is already checked and you still don’t see a default form, then your theme may not include one.
- Open your BigCommerce dashboard, then navigate to Storefront > Themes.
- From the Current Theme section, click the Advanced dropdown then choose Edit Theme Files.
- If you’re using a default theme, you will not be able to select this option. Instead:
- Click Make a Copy, name it, then select Save a Copy.
- Once it’s added to the Themes section, select the 3 dots, then choose Edit Theme Files. Note that any edits you make will only apply to the theme you're editing, and you'll need to apply the theme to your website to see the changes reflected.
- In the left sidebar, open the file corresponding to where the default form appeared on your site. If the default form was located in the footer, like in the example, navigate to templates > components > common, and click the footer.html file.
- Use the find shortcut (Command+F on Mac or Control+F on Windows) to search the word “newsletter” within the footer file.
- Within the code beneath it, find the reference to the form. In the example, the form is referenced in a different file path: {{> components/common/subscription-form}}.
- In the left sidebar, follow the file path referenced in the code (in this example, select components > common > subscription-form). You’ll see the actual components of the default form from here.
- Because the default form's header and language matches the rest of our site's styles, we're only going to replace the actual form input. In the source code, you can see that the default form’s input is contained in the <form> element.
- Highlight everything between the opening and closing <form> tags, then paste the embed code that you copied from Klaviyo to replace the highlighted text.
- Click Save and apply file to apply these changes to your website.
- If the button only says Save file, then the file you just edited is not your Current Theme yet. You’ll need to click Save file, then scroll up and select Edit Theme Files > Save > Use as Active Theme in the top right corner to apply the theme to your website.
Once you’ve pasted the embed code, saved, and applied the changes in BigCommerce, navigate back to your website and refresh the page. Your Klaviyo embed form will display on your site and begin adding new subscribers to the Klaviyo list linked to the form.
If you don’t see your form, see troubleshooting embed forms.
Next steps
Next, create a welcome series flow to make an immediate impact on your new subscribers.
Additional resources
- How to create an email welcome series
Learn how to create a sequence of emails sent directly after someone subscribes to hear from your brand. This is a critical moment in the customer lifecycle because it's your opportunity to introduce new, interested prospects to your business and product offering. With a welcome series, you should capitalize on this display of interest.
- How to disable notification emails sent by BigCommerce
Learn how to disable different types of notification emails sent by BigCommerce. If you are currently sending certain emails with BigCommerce - such as abandoned cart or order status emails - and plan to start sending them via Klaviyo, you will need to disable these emails in BigCommerce to avoid sending them twice.
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